Hyvor Developer
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Code
<?php
$username = (isset($fisrtname, $lastname)) ? $fisrtname . ' ' . $lastname : "Guest";
echo $username . '<br>';

$fisrtname = 'Hyvor';
$lastname = 'Developer';
$username = (isset($fisrtname, $lastname)) ? $fisrtname . ' ' . $lastname : "Guest";
echo $username;
Result